Split-core transformer



Sept. 29,1925.

Patentetl Sept. 29, 1925.

UNITED STATES PATENT OFFICE- STANLEY LLANIDAIEF BURNETE 1.11vns, or rononro, ON'IJARIO, CANADA, ASSIGNOR. 'ro THE LINCOLN METER COMPANY, LI1VII'IED, or TORO1\TTO,ONTABIO, CANADA.

SPLIT-CORE TRANSFOR1VIER.

Applcation filed September 25. 1922.

T0 (17Z wh om it mag concern:

Be it lrnowvn that 1, STANLEY LLANDAFF lunrmrr LINES, a subject of the King of Great Britain, ancl resident of the city ot 'loronto. county of York, Province of O11- tario. in tlre Dominion o;t Canada, have in rentetl certain new and usefnl Improve- 1nents in Split-Gorelranstorrners,describecl in tl1e ollowing specification, ancl illustratc(l in tlic accompanying alravvings tlnat for1n part of the same.

'lhe principal objects of the invention are to tacilitate the testing ot an electrical service without interfering with sa1ne ancl to P10Vltl a split core transfor1ner which \V1ll ofier the minimum of n1agnetic reluc tance an jl wlrich nray be made at extremely low oost.

11 turther ancl very important object is to provide a transforniei. which will enalole an instantaneous change of ratio by substitut ing different coils ancl thereby provicling a remarkable lielcl o1 alteration.

still further object is to produce greater macuracy on low prirnary a1npere tnrns.

.lhe principal features of tl1e invention consist in the nevel construction of the translorrner whereby the coil is loosely mounted upon a flat slab core section and the other section of the core presents flat suraces of consirlemble area to engage the flat section, and whereby said secti-ons are securely held in contact by hinged clamps.

111 the drawings Figure 1 is perspective view slxowing rny i1nproveal. transformer with tl1c sections cla1nped in place.

lignre 2 is a perspective view showing he clarnps releasecl and the movable core section separated trom the main section.

A split core transformer is very clesirable tor the reas0n that a section of the core may be 1novecl te allen of the transformer being placetl upon a service cable without in any 1nanner interfering with the service. It is, however, essential that the core sec tions be unite l so as to ofler very little, it an v magnetic reluctance loy reason of the clivision and the present structure of transforn1er has been constructecl particnlarly with tl1at encl in view.

Tl1e main section 1 of the transformer core is 0rmecl of laminations of substantially U-shape forming a ehannel 2 to receive the service calole. The upper flanges 3 extend laterally for a consiclerable length Serial N0. 590,530.

so that the tops thereof Will present surfaces 1 01 consiclerable area. These surfaces 4 are preferably 1nachined very smooth ancl truc.

fiat slab 5 for1necl of laminations anl having a true ace 6 corresponcls approximately in outside clirnensions with the fianges 3 ancl extends over ancl closes the channel 2, the aces 6 which are preferably machinecl s1nooth and truc making practically perfect contact with the surtaces 4.- and thus completing the c0re.

The slab 5 is loosely held trom being clis engagecl entirely from the 1nain section by means of slotted strips T secured thereto by the bolts 8, saicl strips being pivotally se curecl to the outer ends of one 0 the flanges 3.

A pair oi U-shapecl cla1np irons 9 are pivotally securecl, one to each of the flanges 3 at the outer encls thereof. The cross bars of these clainpetl irons are provided with centrally threadecl holes 10 through which the scleWs 11 extencl, which screws engage ancl operate the clamping bars 12. The bars 12 are formeel with notches 13 at tlne ends Which slidably engage the parallel sicles of the irons 9.

The transtor1ner coil l lis adapted to be slippecl on to the core me1nber 5 ancl fits into the channel 2. When the core is thus locatecl the cla1nps are tightenecl clown upon the slab, thus clrawing the two core sec tions into the closest possible contact.

It W1ll be readily seen that a transformer constructecl 1S describecl may be hancllecl very expeditiously. In order to place 1' upon a service cable it is 1nerely necessary to loosen the clamps, swing them ontwardly, swing tlie slab 5 away from the main section 1 ancl place the main section over the calole. lhe slab is tl1en svvungback into place ancl the clamps returnel to their position ancl tightenecl clown. H a coil of a different ratio is required. it is merely nec essary to loosen the slab 5 slip one coil ofl ancl another on in its place. Tl1e coil is proviclecl with suitable binding screws 15 to which terminals of a meter may be connectecl to effect a realing of tl1e current flowing in the cable.

VVhat I claim as 1ny invention is 2-- 1. A transformer, comprising, a pair of ccre sect-ions enclosing a transverse opening ancl hingecl at one scle of saiol opening, a transiormer coil surrounding one of said 

